make sudo template clearer as far as dm unix account

etc/dm.sudo-rules.template

 ## DM user sudo functions
 ## All strings starting with DM_* have to be replaced with actual values 
 Host_Alias HOST=DM_HOSTNAME
-User_Alias USER=DM_SYSTEM_USER
-Cmnd_Alias SETFACL=/usr/bin/setfacl -m group\:*\:rx DM_DATA_DIR/*
+User_Alias USER=DM_SYSTEM_UNIX_ACCOUNT
+Cmnd_Alias SETFACL=/usr/bin/setfacl -m group\:*\:rx DM_STORAGE_DIR/*
 Cmnd_Alias USERMOD=/usr/sbin/usermod -a -G * *
 Cmnd_Alias GROUPADD=/usr/sbin/groupadd *
 Cmnd_Alias CHOWN=/bin/chown -R \:* *